Air Combat
Ace Combat 2
Ace Combat 3: Electrosphere (btw the JP version is superior to the EN version)
Ace Combat 4: Shattered Skies
Ace Combat 5: The Unsung War
Ace Combat Zero: The Belkan War
Ace Combat 6: Fires of Liberation
Ace Combat 7: Skies Unknown
Ace Combat Assault Horizon
Ace Combat Infinity
Ace Combat X: Skies of Deception
Ace Combat Advance
Ace Combat Xi: Skies of Incursion
Ace Combat: Northern Wings
Ace Combat: Assault Horizon Legacy (which was really just a 3DS port of Ace Combat 2)
Ace Combat Joint Assault
Ace Combat Assault Horizon: Trigger Finger
And if you wanna get super picky, there's Air Combat 22 and the original Arcade version of Air Combat
This one isn't an Ace Combat game but it was made by Project Aces and features the Nosferatu from AC6, Mach Storm
Hahaha no, it wasn't made by Project Aces, but it's a game made by Ace Combat fans for Ace Combat fans.